Double-Containment Coil With Enhanced Winding Mounting for Transcranial Magnetic Stimulation With Reduced Acoustic Noise

Objective: This work aims to reduce the acoustic noise level of transcranial magnetic stimulation (TMS) coils. TMS requires high currents (several thousand amperes) be pulsed through coil, which generates a loud impulse whose peak sound pressure (SPL) can exceed 130 dB(Z). poses risk hearing and elicits unwanted neural activation auditory brain circuits. Methods: We propose new double-containment coil with enhanced winding mounting (DCC), utilizes impedance mismatch contain dissipate impulsive within an air-tight outer casing. The is potted into rigid block, mounted casing block's nodes that are subject minimum vibration during pulse. rest block isolated from by air gap, absorbed polyester fiber panels thickness under center minimized maximize electric field output. Results: Compared commercial figure-of-eight coils, DCC prototype has 18-41 dB(Z) lower SPL at matched strength, whilst providing 28% higher maximum strength than equally focal Conclusion: design greatly reduces while increasing achievable strength. Significance: reduction our comparable provided typical protection devices. approach enhance safety co-activations in other detrimental effects sound.